在Kubernetes中，使用复制控制器时如何设置Pod的名称?

问题描述

我有一个简单的复制控制器yaml文件，如下所示:

I have a simple replication controller yaml file which looks like this:

apiVersion: v1
kind: ReplicationController
metadata:
  name: nginx
spec:
  replicas: 3
  selector:
    app: nginx
  template:
    spec:
      containers:
      - image: library/nginx:3.2
        imagePullPolicy: IfNotPresent
        name: nginx
        ports:
        - containerPort: 80
    metadata:
      labels:
        app: nginx

运行此复制控制器后，我将获得3个不同的Pod，其名称为"nginx-xxx"，其中"xxx"代表字母和数字的随机字符串.

And after running this replication controller, I will get 3 different pods whose names are "nginx-xxx", where "xxx" represents a random string of letters and digits.

我想要的是为复制控制器创建的Pod指定名称，以便Pod的名称可以是"nginx-01"，"nginx-02"，"nginx-03".更进一步，例如，如果pod"nginx-02"由于某种原因而关闭，并且复制控制器将自动创建另一个nginx pod，并且我希望这个新的nginx pod的名称保持为"nginx-02".

What I want is to specify names for the pods created by the replication controller, so that the pods' name can be "nginx-01", "nginx-02", "nginx-03". And further more, for say if pod "nginx-02" is down for some reason, and replication controller will automatically create another nginx pod, and I want this new nginx pod's name to remain as "nginx-02".

我想知道这是否可能吗?预先感谢.

I wonder if this is possible? Thanks in advance.

推荐答案

可以使用 statefulsets (自1.9版以来已处于beta版).引用文档:使用kind: StatefulSet时，

This can be implemented using statefulsets which is out of beta since version 1.9. Quoting the documentation: When using kind: StatefulSet,

StatefulSet中的每个Pod都从StatefulSet的名称和Pod的序数派生其主机名.构造的主机名的模式为$(statefulset name)-$(ordinal).

Each Pod in a StatefulSet derives its hostname from the name of the StatefulSet and the ordinal of the Pod. The pattern for the constructed hostname is $(statefulset name)-$(ordinal).

因此在上面的示例中，您将获得nginx-0，nginx-1，nginx-2

So in the example above, you would get nginx-0,nginx-1,nginx-2

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